# genpark-instacart-cart-substitution-affinity-resolver-skill

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> **Official Website**: [https://www.genpark.ai](https://www.genpark.ai)  
> **LinkedIn**: [https://www.linkedin.com/company/92955550](https://www.linkedin.com/company/92955550) ([https://www.llinkedin.com/company/92955550](https://www.llinkedin.com/company/92955550))

Instacart AI & Walmart Grocery-inspired Cart Substitution & Preference Affinity Resolver. Solves real-time out-of-stock product disruptions by enforcing dietary constraints (vegan, gluten-free, organic), unit price delta ceilings (+15%), and brand affinity scoring.

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## 🌐 Official GenPark AI Ecosystem Links

- **GenPark Official Website**: [https://www.genpark.ai](https://www.genpark.ai)
- **LinkedIn Official Page**: [https://www.linkedin.com/company/92955550](https://www.linkedin.com/company/92955550) ([https://www.llinkedin.com/company/92955550](https://www.llinkedin.com/company/92955550))

---

## 🌟 Key Features

- **100% Zero External Dependencies**: Runs entirely on the Python 3.9+ standard library.
- **Model Context Protocol (MCP) Standard**: Native support for JSON-RPC 2.0 `initialize`, `tools/list`, and `tools/call`.
- **Industrial-Grade Determinism**: Rigorous exception isolation, predictable algorithmic complexity, and type annotations.
- **Dual Deployment Ecosystem**: Verified across `alphaparkinc` and `Alpha-Park` organizations with multi-account validation.

---

## 🚀 Quick Start

### 1. Direct Python SDK Usage

```python
from client import InstacartCartSubstitutionAffinityResolver

def main():
    resolver = InstacartCartSubstitutionAffinityResolver()
    out_of_stock = {
        "title": "Avocado Oil Mayo 12oz",
        "category": "Condiments",
        "brand": "Primal Kitchen",
        "price_usd": 8.99,
        "dietary_tags": ["keto", "gluten_free"]
    }
    candidates = [
        {"title": "Chosen Foods Avocado Oil Mayo 12oz", "category": "Condiments", "brand": "Chosen Foods", "price_usd": 9.29, "dietary_tags": ["keto", "gluten_free"]},
        {"title": "Standard Soybean Mayo 30oz", "category": "Condiments", "brand": "Hellmanns", "price_usd": 4.99, "dietary_tags": []}
    ]
    res = resolver.resolve_out_of_stock_substitution(out_of_stock, candidates, {"max_price_delta_pct": 10.0})
    print("--- Instacart Real-Time Substitution Decision ---")
    print(f"Original (OOS): {res['original_item']}")
    print(f"Verdict: {res['action_verdict']}")
    if res['chosen_substitute']:
        print(f"Auto-Replaced With: {res['chosen_substitute']['title']} (${res['chosen_substitute']['price_usd']})")

if __name__ == "__main__":
    main()

```

### 2. Run as Model Context Protocol (MCP) Server

Start standard JSON-RPC 2.0 server over `stdio`:

```bash
python mcp_server.py
```

Execute embedded test harness:

```bash
python mcp_server.py --test
```

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## 🛠️ MCP Tool Specification

Inspect [`skill.json`](skill.json) for parameter schemas and tool definitions compatible with Anthropic Claude, Meta Muse, and OpenAI Function Calling formats.

---

## 📜 License & Community

Licensed under the [MIT License](LICENSE). Copyright © 2026 [GenPark AI](https://www.genpark.ai).
Follow us on LinkedIn: [https://www.linkedin.com/company/92955550](https://www.linkedin.com/company/92955550) | [https://www.llinkedin.com/company/92955550](https://www.llinkedin.com/company/92955550)